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  1. /*
  2.  * Copyright (C) 2006 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /*
  30.  * This is the generic page hash table interface.
  31.  * Architectures that use single page hash table for
  32.  * storing page translations must implement it.
  33.  */
  34.  
  35. #ifndef __PAGE_HT_H__
  36. #define __PAGE_HT_H__
  37.  
  38. #include <mm/page.h>
  39. #include <typedefs.h>
  40.  
  41. /** Page hash table size. */
  42. #define HT_WIDTH            HT_WIDTH_ARCH
  43. #define HT_SIZE             (1<<HT_WIDTH)
  44. #define HT_ENTRIES          (HT_SIZE/sizeof(pte_t))
  45.  
  46. /** Hash function.
  47.  *
  48.  * @param page Virtual address. Only vpn bits will be used.
  49.  * @param asid Address space identifier.
  50.  *
  51.  * @return Pointer to hash table typed pte_t *.
  52.  */
  53. #define HT_HASH(page, asid)     HT_HASH_ARCH(page, asid)
  54.  
  55. /** Compare PTE with page and asid.
  56.  *
  57.  * @param page Virtual address. Only vpn bits will be used.
  58.  * @param asid Address space identifier.
  59.  * @param t PTE.
  60.  *
  61.  * @return 1 on match, 0 otherwise.
  62.  */
  63. #define HT_COMPARE(page, asid, t)   HT_COMPARE_ARCH(page, asid, t)
  64.  
  65. /** Identify empty page hash table slots.
  66.  *
  67.  * @param t Pointer ro hash table typed pte_t *.
  68.  *
  69.  * @return 1 if the slot is empty, 0 otherwise.
  70.  */
  71. #define HT_SLOT_EMPTY(t)        HT_SLOT_EMPTY_ARCH(t)
  72.  
  73. /** Invalidate/empty page hash table slot.
  74.  *
  75.  * @param t Address of the slot to be invalidated.
  76.  */
  77. #define HT_INVALIDATE_SLOT(t)       HT_INVALIDATE_SLOT_ARCH(t)
  78.  
  79. /** Return next record in collision chain.
  80.  *
  81.  * @param t PTE.
  82.  *
  83.  * @return Successor of PTE or NULL.
  84.  */
  85. #define HT_GET_NEXT(t)          HT_GET_NEXT_ARCH(t)
  86.  
  87. /** Set successor in collision chain.
  88.  *
  89.  * @param t PTE.
  90.  * @param s Successor or NULL.
  91.  */
  92. #define HT_SET_NEXT(t, s)       HT_SET_NEXT_ARCH(t, s)
  93.  
  94. /** Set page hash table record.
  95.  *
  96.  * @param t PTE.
  97.  * @param page Virtual address. Only vpn bits will be used.
  98.  * @param asid Address space identifier.
  99.  * @param frame Physical address. Only pfn bits will be used.
  100.  * @param flags Flags. See mm/page.h.
  101.  */
  102. #define HT_SET_RECORD(t, page, asid, frame, flags)  HT_SET_RECORD_ARCH(t, page, asid, frame, flags)
  103.  
  104. extern page_operations_t page_ht_operations;
  105. extern spinlock_t page_ht_lock;
  106.  
  107. extern pte_t *page_ht;
  108.  
  109. extern void ht_invalidate_all(void);
  110.  
  111. #endif
  112.